[lxsmnsyc]

Port of solidjs/solid-start#2370. The upload code from #4208 has the same bug.

A multipart part always arrives on the server as a File. With enableRichArguments(), a blob comes back as a File named blob, an empty type becomes application/octet-stream, lastModified is the time the server parsed the request, and %22 in a name is decoded to ".

The upload node now carries the type, plus the name and lastModified for a file. The server rebuilds a Blob or File from those fields over the part's bytes, without copying them. A node with only the index, sent by a tab opened before a deploy, still reads as the raw part.

• packages/web/server-functions/src/uploads.ts: write and read the metadata fields
• packages/web/test/server/server-functions-uploads.spec.tsx: the blob test now expects a Blob with its type (including an empty one) instead of a File named blob. New tests cover the exact name and lastModified, and an index-only node from an older client.
• Patch changeset for @solidjs/web

A single File or Blob argument still goes as a native body, not through the upload codec, so this change does not touch it.

Checked locally: the three @solidjs/web vitest suites (1647, 1934 and 754 tests), test-types, and prettier. The 3 new tests fail without the fix.

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: e4afb97

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 15 packages

Name	Type
@solidjs/web	Patch
@solidjs/babel-plugin	Patch
@solidjs/diagnostics	Patch
@solidjs/element	Patch
@solidjs/h	Patch
@solidjs/html	Patch
test-integration	Patch
board-example	Patch
canvas-example	Patch
server-dbmon-example	Patch
todos-server-example	Patch
@solidjs/compiler	Patch
@solidjs/signals	Patch
solid-js	Patch
@solidjs/universal	Patch

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[codspeed]

Merging this PR will improve performance by 16.33%

1 warning

⚠️ 1 benchmark is dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

⚡ 2 improved benchmarks
✅ 198 untouched benchmarks
⏩ 5 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	projection derive: write one NESTED field (reference)	2.7 ms	2.1 ms	+27.31%
⚡	arrow in template	11.7 ms	11 ms	+6.31%

Tip

Curious why performance improved? Comment @codspeedbot explain why performance improved on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing lxsmnsyc:fix/upload-blob-metadata (e4afb97) with next (97e1826)}

Footnotes

1. 5 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩